Ruling Haymaker possible?

[Lou Cypher]

Is it still possible to make those haymaker decks, with cards such as the base set Scyther, in the Deoxys-On format?

Other question: Is there a modern-day equivalent of the old Mr. Mime that could not get over 20 damage?

 

[Abhorsen]

No it's not possible. Not to mention that it would get owned by Exs from DF.

 

[Charizard]

Other question: Is there a modern-day equivalent of the old Mr. Mime that could not get over 20 damage?

No, the name mentioned is refered to that card itself.