It hasn't evolved in any known episode as of 10/15/11.
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the episode that ashs grovyle evolves is odd Pokemon out that's the name of the episode and the season is battle frontier
It will probably never evolve into emboar because in an upcoming episode pignite is tryin to resist his evolution same with Ash's oshawott and snivy.
Level 17 Oshawott evolves into Dewott. Level 36 Dewott evolves into Samurott.
Dewott at Level 17
Oshawott evolves to Dewott on level 17 (Dewott evolves to Samurott on level 36)