Choose the Games that You Want to Trade Between
To begin, choose the game to trade from, OR use the form below.
This page explains how to trade from Pokémon Y to Pokémon Ultra Sun.
What You Need
To send pokémon from Pokémon Y to Pokémon Ultra Sun, you need to download Pokémon Bank from the Nintendo 3DS eShop, then open Pokémon Bank and go to the main menu, then tap "Download Poké Transporter". If you downloaded Pokémon Ultra Sun from the eShop, be sure to download Pokémon Bank to the same 3DS that has the game on it.
In-Game Requirements
Before you can trade from Pokémon Y to Pokémon Ultra Sun, you need to have the Pokédex.
How to Trade
Transfer Pokémon from Pokémon Y to Pokémon Bank
If you already have Pokémon Bank, you can proceed with the trade. If you downloaded it in the past, you can redownload it from the eShop Settings menu if needed. It is no longer possible to get Pokémon Bank from the 3DS shop, so if you have not downloaded it in the past, it will not be possible for you to transfer your pokémon from Pokémon Y to Pokémon Ultra Sun.
Open Pokémon Bank. If you are prompted for your password, enter it and sign in. Choose "Use Pokémon Bank" in the Pokémon Bank menu. Use the cursor to choose Pokémon Y in the top screen, then choose "Use this game".
If a message says that your Pokémon Link is full, you will be asked if you still want to use Pokémon Bank. You won't lose your gifts if you say Yes. You can get your gifts by opening Pokémon Y and choosing Pokémon Link in the game select menu to receive your gifts from Pokémon Bank.
Back in Pokémon Bank, after you select Pokémon Y and choose "Use this Game", your PC Boxes in Pokémon Y will be displayed in the touch screen, and your Pokémon Bank boxes will be displayed in the upper screen. Use the control pad or circle pad (the stylus cannot be used in Pokémon Bank) to move the desired pokémon from Boxes in the the touch screen to Boxes in the upper screen.
You can press START to switch between a red cursor, which shows you several options when you select a pokémon with it; a blue cursor, which picks up one pokémon at a time without showing any options; and a green cursor, which allows you to select multiple pokémon at a time.
When you are done moving your pokémon from Pokémon Y to Pokémon Bank boxes, press the X button to save your changes and return to the title screen.
Transfer Pokémon from Pokémon Bank to Pokémon Ultra Sun
Press a button to go to the Pokémon Bank menu again. Now select Pokémon Ultra Sun and choose "Use this Game". Then use the control pad or circle pad to move the desired pokémon from the Pokémon Bank box in the top screen to one of your Pokémon Ultra Sun PC Boxes in the touch screen. When you are done, press X to save and exit.