Espurr evolves into Meowstic starting at level 25.
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Spritzee evolves into Aromatisse by trading while holding the item Sachet.
No, Mewtwo cannot evolve into Mewthree. Mewthree isn't an existing Pokémon however Mewtwo can use a Mega Stone in Pokémon X and Pokémon Y in order to mega evolve during battle into MegaMewtwo.
Scatterbug evolves into Spewpa starting at level 9. It will later evolve into Vivillon once it reaches level 12.
Mewtwo can Mega Evolve into either Mega Mewtwo Y or Mega Mewtwo X.
Espurr will evolve into Meowstic starting at level 25. Take in mind that the female Meowstic move-pool is more offensive, while the male is more supportive.
No, it is not possible to encounter wild Espurr in Alpha Sapphire or Omega Ruby. It must be traded over from X or Y, if not transferred through Pokémon Bank.
You can evolve Eelektrik by using a thunderstone.
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At level 42.
Meowth, Drowzee, Sentret, Sneasel, Spinda, Chimchar, and Espurr are Pokemon capable of learning Assist as an egg move.
You cannot catch Meowstic in Pokémon X, Pokémon Y, Pokémon Omega Ruby or Pokémon Alpha Sapphire however you can catch its pre-evolved form of Espurr in Route 6 in Pokémon X and Pokémon Y and then you can continue to battle with it until you can evolve it into Meowstic once it reaches Level 25.
Mewtwo cannot evolve, but it can mega evolve temporarily in Pokemon X, Y, Alpha Sapphire, and Omega Ruby by letting it hold a Mewtwonite X or Mewtwonite Y.
Chimecho is unable to evolve as of Pokemon X and Y. Chimecho does evolve from a Pokemon called Chingling when it's at max happiness and during night time.
No, because Mega Evolution wasn't introduced until Pokemon X and Y.
Machop evolves into Machoke at level 28.
Ducklett evolves at level 35.