BALL x PIT
BALL x PIT
Every evolution needs specific balls at level 3, and fusing them spends both. This works out what that actually costs you.
Click the balls you're carrying. Anything you could fuse right now lights up green.
Switch to Goals and click what you want.
Everything you still need to pick up turns amber — with a ×2
when the run has to hand you the same ball twice.
Fuse mode pairs any two balls. It'll tell you when a pair evolves instead, and what into.
Unofficial fan tool, free and unaffiliated. Ball data from the BALL x PIT Wiki.