yea Maganium 'd' owns Empoleon pretty bad.
but Im not sure how to effectively tech that in Infernape...
maybe 1-0-1 Meganium with Multi energies... idk
What type of Empoleon deck?
Does it use Mantine? If yes, then Meganium d wont be very useful.
Does it use Lucario? If yes, then Meganium d would own the deck
Like i said, further details will only help us help you.