unlock mystery jungle (30 floor dungeon and unlock it after beating darkrai through random spinda caffe request ). grovyle should appear after about the first 5 floors. However, if you meant the grovyle that assists you, no, he remains in the future (beat dialga and play the sub-story to see what happens to him). He only temporarily joins your team though, as you two play through hidden land and treeshroud forest
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yes
You can't get him to join you... BUT... in the end, when you beat primal dialga, you will unlock the final special episode you can play the game as him. The whole gang'll be there, sableye, primal dialga, spiritomb, dusknoir, celebi and Grovyle. If you aren't talking about the one who was your friend when you were human, then there's a grovyle in mystery jungle. look at serribi.net (sorry if I misspelled it)
Actually yes. It is the 5th Special Episode of your Episode List.Ithink this guy's messing with you.
in explorers of sky, he sends a message saying he's okay. EDIT: your character (the Pokemon you turned into) never sees grovyle again, and never does hear the message. Grovyle sent it "on the winds" in the future. unless dialga or celebi does something, grovyle never sees you again probably.
first beat them once then go to them aguin and wen you beat them for the secend time it will want to join your team