grovyle can't learn mega drain, it isn't possible, not in both hoenn and sinnoh. however, it can learn giga drain (which is much better) via tm. also, if you ever have questions about a pokemon's evolutions or move/learnset, you can visit bulbapedia.
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Only Treeko can learn Mega Drain at level 26 in all games. It evolves into Grovyle at level 16 and into Sceptile at level 36.
Gloom learns Mega Drain at level 23.
grotle learns mega drain at level 27
No. It can't learn Mega Drain but it can learn Giga Drain.
Sceptile learns false swipe at level 59. This Pokemon evolves from Grovyle at level 36. Sceptile is a final form but using a mega evolution stone, does have a mega evolution.