How to evolve Grookey in Cobblemon.
Grookey evolves into Thwackey when it reaches level 16.
Evolution line
GrookeyWhat Grookey needs
1 path
ThwackeyLevel up
Level 16
Moves it learns on evolving
Double Hit
These are offered the moment the evolution completes. Decline them and you have to relearn them later.
Is it worth it
Grookey nowgrass310
Thwackeygrass420
Base stat totals, from the Cobblemon 1.7.3 species files.