The listed Pokemon can evolve in X and Y: Mewtwo, Blaziken, Lucario, Venusaur, Charizard, Blastoise, Alakazam, Gengar, Kangaskhan, Pinsir, Gyarados, Aerodactyl, Heracross, Ampharos, Scizor, Houndoom, Tyranitar, Gardevoir, Mawile, Aggron, Medicham, Manetric, Banette, Absol, Garchomp, and Abomasnow. These Pokemon can mega evolve only in Omega Ruby and Alpha Sapphire: Beedrill, Pidgeot, Slowbro, Steelix, Sceptile, Swampert, Sableye, Sharpedo, Camerupt, Altaria, Glalie, Salamence, Metagross, Latias, Latios, Rayquaza, Lopunny, Gallade, Audino, and Diancie.
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Mudsdale is a Ground type, and it was introduced in the Generation 7 games, Pokemon Sun and Pokemon Moon. The evolution path for Mudsdale is Mudbray (Ground) >>> Mudsdale (Ground).
Currently, Pikachu does not have a Mega Evolution form or haven't announced a Mega Evolution. Relating to Mega Evolution, Raichu, however, will have a Alola Form, exclusive to the upcoming Pokemon Sun and Moon.
Yungoos is a Normal type, and it was introduced in the Generation 7 games, Pokemon Sun and Pokemon Moon. The evolution path for Yungoos is Yungoos (Normal) >>> Gumshoos (Normal).
Fomantis is a Grass type, and it was introduced in the Generation 7 games, Pokemon Sun and Pokemon Moon. The evolution path for Fomantis is Fomantis (Grass) >>> Lurantis (Grass).
Steenee is a Grass type, and it was introduced in the Generation 7 games, Pokemon Sun and Pokemon Moon. The evolution path for Steenee is Bounsweet (Grass) >>> Steenee (Grass) >>> Tsareena (Grass).
There are 802 different species of Pokemon currently up to Pokemon Sun and Moon. This excludes Mega Evolution forms, Alolan forms, and other varieties of Pokemon.
Mudsdale is a Ground type, and it was introduced in the Generation 7 games, Pokemon Sun and Pokemon Moon. The evolution path for Mudsdale is Mudbray (Ground) >>> Mudsdale (Ground).
Currently, Pikachu does not have a Mega Evolution form or haven't announced a Mega Evolution. Relating to Mega Evolution, Raichu, however, will have a Alola Form, exclusive to the upcoming Pokemon Sun and Moon.
Lurantis is a Grass type, and it was introduced in the Generation 7 games, Pokemon Sun and Pokemon Moon. The evolution path for Lurantis is Fomantis (Grass) >>> Lurantis (Grass).
Gumshoos is a Normal type, and it was introduced in the Generation 7 games, Pokemon Sun and Pokemon Moon. The evolution path for Gumshoos is Yungoos (Normal) >>> Gumshoos (Normal).
Yungoos is a Normal type, and it was introduced in the Generation 7 games, Pokemon Sun and Pokemon Moon. The evolution path for Yungoos is Yungoos (Normal) >>> Gumshoos (Normal).
Fomantis is a Grass type, and it was introduced in the Generation 7 games, Pokemon Sun and Pokemon Moon. The evolution path for Fomantis is Fomantis (Grass) >>> Lurantis (Grass).
Tsareena is a Grass type, and it was introduced in the Generation 7 games, Pokemon Sun and Pokemon Moon. The evolution path for Tsareena is Bounsweet (Grass) >>> Steenee (Grass) >>> Tsareena (Grass).
Steenee is a Grass type, and it was introduced in the Generation 7 games, Pokemon Sun and Pokemon Moon. The evolution path for Steenee is Bounsweet (Grass) >>> Steenee (Grass) >>> Tsareena (Grass).
Bounsweet is a Grass type, and it was introduced in the Generation 7 games, Pokemon Sun and Pokemon Moon. The evolution path for Bounsweet is Bounsweet (Grass) >>> Steenee (Grass) >>> Tsareena (Grass).
Type: Null is a Normal type, and it was introduced in the Generation 7 games, Pokemon Sun and Pokemon Moon. The evolution path for Type: Null is Type: Null (Normal) >>> Silvally (Normal). However, the Silvally evolution can change type depending on what is placed in its RKS system drive.
Sandygast is a Ghost-Ground type, and it was introduced in the Generation 7 games, Pokemon Sun and Pokemon Moon. The evolution path for Sandygast is Sandygast (Ghost-Ground) >>> Palossand (Ghost-Ground).