Once purchased, the Gattomon automatically appears in your wallet. To make it playable, ensure that your wallet is linked to the game. Then, send the Gattomon to the following wallet address:
UQAkxfbcc-I2DH93ir5Eh4TUQxese94He6KHil_R1hV-5taJ
In some cases, the address may start with UQ instead of EQ
After completing this step, your Gattomon will be available for use in the game again.