In pokemon y can you mega evolve an Infernape

There aren't that many entirely new Pokemon in this generation...some people are upset about this. Not counting mega evolutions (which I don't believe appear in the Pokedex as normal), the count is believed to be up to 718 as of this writing.

The Pokemon that have mega evolutions at the moment are somewhat arbitrary, in my opinion. Notably the only starters on the list are the Kanto starters (one of which has TWO versions) and Blaizken, and there are no new sixth generation Pokemon with a mega evolution! According to Serebii this is the current list (and this is believed to be final at this point, as there are no other known mega stones).

• Venusaur
• Charizard (two formes, X and Y)
• Blastoise
• Alakazam
• Gengar
• Kangaskhan
• Pinsir
• Gyarados
• Aerodactyl
• Mewtwo (two formes, X and Y)
• Ampharos
• Scizor
• Heracross
• Houndoom
• Tyranitar
• Blaziken
• Gardevoir
• Mawile
• Aggron
• Medicham
• Manectric
• Banette
• Absol
• Garchomp
• Lucario
• Abomasnow

Note that most mega evolutions have different abilities, and a few even change their typing!