No, Mightyena cannot learn Surf. Surf is a Water-type move typically reserved for certain Water-type Pokémon, and Mightyena, being a Dark-type Pokémon, does not have the capability to learn it through leveling up, TMs, or any other means in the games.
Mightyena doesn't learn the move crunch in Diamond and Pearl. I think it does in ruby sapphire and emerald.
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lvl 57
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It evolves into Beastyena using a Dusk Stone.
You have to use the HM surf It does not learn surf by leveling
No. Seviper cannot learn surf.
No, Togepi cannot learn Surf.
Vanillite cannot learn Surf.
Keckleon Mightyena and oall the pokemon learn using a TM.
One can learn how to surf from websites like About, Away, Lajolla Surf, Surfing Waves, Learn to Surf, wikiHow, Surf Science, New Quay Surfer, Surf Noosa and Dano Surf.
Slowpoke does not learn Surf by levelling up, but it can learn Surf via HM in all generations.