Torterra
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Evolution Chain
Turtwig > Grotle > Torterra
Ash's Grotle evolved in the episode "Aiding The Enemy!". It evolved during a battle with a trainer's Honchrow.
Grotle is not able to learn the move Earthquake by leveling or by TMs. It's evolved form Torterra is able to learn Earthquake at level 32.
Yes, there is. Grotle is the first evolution of Turtwig, while Torterra is the second. Turtwig evolves into Grotle at level 18 and then into Torterra at level 32.
Ash's Grotle evolved into Torterra in the episode that's titled "The Fleeing Tower of Sunyshore."
not likely squirtle and bulbasaur never evolved
No, only fully-evolved grass starters can learn Frenzy Plant. You would have to evolve your Grotle into Torterra to learn it.
the episode is the fleeing tower of sunyshore
Ash's Grotle evolved into a Torterra in The Fleeing Tower of Sunyshore
Ash's Grotle evolved into Torterra in "The Fleeing Tower of Sunyshore!", episode 166 of the Diamond and Pearl series and episode 632 overall.
Croconaw at level 18 and Feraligatr at level 30.
Yes, Ash's Turtwig evolved into a Grotle right before Season 11: Pokemon Battle Demension ended. He now uses his Grotle during Season 12: Galatic Battle.
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.