No. It can't learn Mega Drain but it can learn Giga Drain.
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If your gloom had mega drain then it evolved vileplume should still have mega drain, all though maybe it can't learn mega drain i do know it can learn giga drain.
Gloom learns Mega Drain at level 23.
grotle learns mega drain at level 27
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.
Lombre does not learn Water Gun,but does learn Hydro Pump