It evolves in the battle against Cynthia.
Ash's Grotle evolved in the episode "Aiding The Enemy!". It evolved during a battle with a trainer's Honchrow.
not likely squirtle and bulbasaur never evolved
Grotle grotle
No,Ash's snivey wont evolve
I am 20% sure that it grotle should evolve 23 episodes after EP603
you do not need a stone to evolve a grotle. he evolves a Lv.32
Possibly, but I don't think so. Most of Ash's Pokemon choose not to evolve, besides Grotle had trouble with dodging when he just evolved, and he'll have even more trouble with dodging if he does evolve into Torterra.
A grotle evolves at level 36.
ash's grotle will evolve in the battle againts Cynthia and the elite four
Yes, Buizel will evolve into Floatzel, Chimchar will evolve into monferno, Staravia will evolve into starviraptor, and grotle will evolve into tortera.
Grotle evolves into a Torterra at level 32.
Turtwig-18-Grotle-32-Torterra