No, Mega Evolution can only be used during a battle.
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No, because Mega Evolution wasn't introduced until Pokemon X and Y.
Have it hold the Sceptilite, then press "Mega Evolution" during a battle to Mega Evolve it.
Hitmonlee cannot evolve any further, nor does it have a Mega Evolution form.
Venusaur is the final evolution of the line beginning with Bulbasaur. Venusaur cannot evolve into another form. It can, however, breed (at the Pokemon Daycare) and produce an egg which will give you access to an earlier evolution. Venusaur can Mega Evolve into Mega Venusaur using the Venusaurite. Mega evolution, unlike regular evolution, is temporary, only happening during battle.
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.