Mecha anime help needed

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Guys i need help...
When i was a kid i watched a Mecha anime that i loved, but i can't remember the name, no matter how much i try.
The anime have this features:
1. Two pilots: they are two kids, a black one and a white one
2. I think that the mecha have some kind of weels on the legs or something like that
3. It's weapons are some kind of animal shaped Zords, and the Zord choose it's master.
4. I think i remember that each pilot of the main mecha have a kind of device in which the Zords are kept in and then "released" in order to be used in battle.
5. The enemy is an alien race

If i remember more details i'll come back with the pseudonim of "Help searcher OP"
P.D. Pic unrelated