A pokemon that has been burned will have its attack stat slightly lowered.

Also, a pokemon that has been paralyzed has its speed stat slightly lowered.

With the masuda method, it becomes increasingly common to hatch a shiny pokemon. You just trade for a foreign Pokemon in the GTS and breed it with your region's Pokemon an in a certain number of eggs later you have a shiny Pokemon.

Rhydon was the first pokemon created.

Professor Ivy of the orange islands was the first female professor in the anime, while Professor Juniper is the first female Professor in games.

Ash has never owned a Psychic, Fairy, Steel, or Ghost-type Pokemon as of yet. Probably due to his battling style.

Shinies as they're called appear at a ratio of 1/8192 in the wild.