Listed below is a table of the best pokéballs to use for catching Type: Null. This is calculated based on Type: Null's catch rate, as well as the different possible ball modifiers, health levels, and status condition modifiers. When possible, the conditions required for a particular pokéball modifier are taken into account, but be sure to read the notes below each pokéball to make sure that its bonus applies.

Also, note that for pokémon whose maximum HP is low, the catch probabilities for the Low HP columns might be slightly lower in the actual game than the probabilities displayed here.

Catch Probability	Low HP SLP, FRZ	Low HP PSN, BRN, PAR	Low HP Normal Status	Full HP SLP, FRZ	Full HP PSN, BRN, PAR	Full HP Normal Status
18%	Level Ball If your active pokémon's level is four or more times greater than this pokémon's level. Love Ball If this pokémon has the same national pokédex number as, but the opposite gender of, your active pokémon.	None.	None.	None.	None.	None.
13%	None.	Level Ball If your active pokémon's level is four or more times greater than this pokémon's level. Love Ball If this pokémon has the same national pokédex number as, but the opposite gender of, your active pokémon.	None.	None.	None.	None.
11%		None.	None.	None.	None.	None.
9%	Nest Ball If Type: Null's level is 1 or lower. Level Ball If your active pokémon's level is more than double but less than four times greater than this pokémon's level. Timer Ball If 30 or more turns have passed in battle.	None.	Level Ball If your active pokémon's level is four or more times greater than this pokémon's level. Love Ball If this pokémon has the same national pokédex number as, but the opposite gender of, your active pokémon.	None.	None.	None.
8%	Nest Ball If Type: Null's level is 6 or lower. Dive Ball If this pokémon was encountered while fishing or Surfing in water. Dusk Ball If the Dusk Ball is used in a cave or if the battle began between 8:00PM and 3:59AM		None.	None.	None.	None.
7%	Nest Ball If Type: Null's level is 10 or lower.	None.	None.	None.	None.	None.
6%	Nest Ball If Type: Null's level is 14 or lower. Lure Ball If this pokémon was encountered while fishing. Repeat Ball If this pokémon is listed in your Pokédex as having been caught or owned before.	Nest Ball If Type: Null's level is 6 or lower. Dive Ball If this pokémon was encountered while fishing or Surfing in water. Dusk Ball If the Dusk Ball is used in a cave or if the battle began between 8:00PM and 3:59AM Level Ball If your active pokémon's level is more than double but less than four times greater than this pokémon's level. Timer Ball If 30 or more turns have passed in battle.	None.	Level Ball If your active pokémon's level is four or more times greater than this pokémon's level. Love Ball If this pokémon has the same national pokédex number as, but the opposite gender of, your active pokémon.	None.	None.
5%	Nest Ball If Type: Null's level is 19 or lower.	Nest Ball If Type: Null's level is 11 or lower. Lure Ball If this pokémon was encountered while fishing. Repeat Ball If this pokémon is listed in your Pokédex as having been caught or owned before.		None.	None.	None.
4%	Nest Ball If Type: Null's level is 23 or lower. Level Ball If your active pokémon's level is higher than but less than double this pokémon's level. Ultra Ball	Nest Ball If Type: Null's level is 17 or lower.	Nest Ball If Type: Null's level is 6 or lower. Dive Ball If this pokémon was encountered while fishing or Surfing in water. Dusk Ball If the Dusk Ball is used in a cave or if the battle began between 8:00PM and 3:59AM Level Ball If your active pokémon's level is more than double but less than four times greater than this pokémon's level. Timer Ball If 30 or more turns have passed in battle.	None.	Level Ball If your active pokémon's level is four or more times greater than this pokémon's level. Love Ball If this pokémon has the same national pokédex number as, but the opposite gender of, your active pokémon.	None.
3%	Nest Ball If Type: Null's level is 27 or lower. Great Ball Sport Ball (only available during the bug-catching contest)	Nest Ball If Type: Null's level is 23 or lower. Level Ball If your active pokémon's level is higher than but less than double this pokémon's level. Ultra Ball	Nest Ball If Type: Null's level is 14 or lower. Lure Ball If this pokémon was encountered while fishing. Repeat Ball If this pokémon is listed in your Pokédex as having been caught or owned before.	Nest Ball If Type: Null's level is 2 or lower. Level Ball If your active pokémon's level is more than double but less than four times greater than this pokémon's level. Timer Ball If 30 or more turns have passed in battle.	None.	Level Ball If your active pokémon's level is four or more times greater than this pokémon's level. Love Ball If this pokémon has the same national pokédex number as, but the opposite gender of, your active pokémon.
2%	Poké Ball Friend Ball Premier Ball Luxury Ball	Nest Ball If Type: Null's level is 29 or lower. Great Ball Sport Ball (only available during the bug-catching contest)	Nest Ball If Type: Null's level is 23 or lower. Level Ball If your active pokémon's level is higher than but less than double this pokémon's level. Ultra Ball	Nest Ball If Type: Null's level is 15 or lower. Lure Ball If this pokémon was encountered while fishing. Repeat Ball If this pokémon is listed in your Pokédex as having been caught or owned before. Dive Ball If this pokémon was encountered while fishing or Surfing in water. Dusk Ball If the Dusk Ball is used in a cave or if the battle began between 8:00PM and 3:59AM	Nest Ball If Type: Null's level is 6 or lower. Dive Ball If this pokémon was encountered while fishing or Surfing in water. Dusk Ball If the Dusk Ball is used in a cave or if the battle began between 8:00PM and 3:59AM Level Ball If your active pokémon's level is more than double but less than four times greater than this pokémon's level. Timer Ball If 30 or more turns have passed in battle.	None.
1%	None.	Poké Ball Friend Ball Premier Ball Luxury Ball	Poké Ball Friend Ball Premier Ball Luxury Ball Great Ball Sport Ball (only available during the bug-catching contest)	Nest Ball If Type: Null's level is 27 or lower. Great Ball Sport Ball (only available during the bug-catching contest) Level Ball If your active pokémon's level is higher than but less than double this pokémon's level. Ultra Ball	Nest Ball If Type: Null's level is 23 or lower. Level Ball If your active pokémon's level is higher than but less than double this pokémon's level. Ultra Ball Lure Ball If this pokémon was encountered while fishing. Repeat Ball If this pokémon is listed in your Pokédex as having been caught or owned before.	Nest Ball If Type: Null's level is 15 or lower. Lure Ball If this pokémon was encountered while fishing. Repeat Ball If this pokémon is listed in your Pokédex as having been caught or owned before. Dive Ball If this pokémon was encountered while fishing or Surfing in water. Dusk Ball If the Dusk Ball is used in a cave or if the battle began between 8:00PM and 3:59AM Level Ball If your active pokémon's level is more than double but less than four times greater than this pokémon's level. Timer Ball If 30 or more turns have passed in battle.