Question

May I please have a FULL list of Pokemon that are able to breed with others than it's own kind? (E.G. Wailord & Skitty)?

???

Answer 1

That list is exhaustive. Just look at Pokemon by egg groups here:

Pokemon by egg groups

and all Pokemon in the same egg group can breed with each other.

EDIT: apart from the undiscovered egg group, i.e. legendaries and baby Pokemon.

Answer 2

All Pokemon that's not in the Undiscovered Egg Group can breed.
This means any Pokemon from the, Amorphous, Bug, Dragon, Fairy, Field, Flying, Grass, Human-Like, Mineral, Monster, Water 1, Water 2, Water 3 and Ditto can breed with any Pokemon from the same Egg Group.
Source: http://pokemondb.net/mechanics/breeding