Mutations in Pokémon:

Deoxys:

Ruby The DNA of a space virus underwent a sudden mutation upon exposure to a laser beam and resulted in Deoxys. The crystalline organ on this Pokémon's chest appears to be its brain.

Emerald A Pokémon that mutated from an extraterrestrial virus exposed to a laser beam. Its body is configured for superior agility and speed.


Salamence:

Ruby Salamence came about as a result of a strong, long-held dream of growing wings. It is said that this powerful desire triggered a sudden mutation in this Pokémon's cells, causing it to sprout its magnificent wings.

Emerald After many long years, its cellular structure underwent a sudden mutation to grow wings. When angered, it loses all thought and rampages out of control.

Diamond As a result of its long-held dream of flying, its cellular structure changed, and wings grew out.

Weezing:

FireRed Very rarely, a sudden mutation can result in two small Koffing twins becoming conjoined as a Weezing.

Vaporeon:

Ruby Vaporeon underwent a spontaneous mutation and grew fins and gills that allow it to live underwater. This Pokémon has the ability to freely control water.

Doduo:

FireRed A two-headed Pokémon that was discovered as a sudden mutation. It runs at a pace of over 60 miles per hour.

Eevee:

Red Its genetic code is irregular. It may mutate if it is exposed to radiation from element Stones.

Diancie?:

X A sudden transformation of Carbink, its pink, glimmering body is said to be the loveliest sight in the whole world.

Honorary Mentions:

Mewtwo

Mew

Kyurem (fuses with DNA splicers)

Reshiram

Zekrom