I remember a movie with the following parts in it...

It's about a robots(suit) that can be used only if you believe in yourself.

A boy needs to prove that he does by jumping of a cliff directly into (yes INto) a rock. The rock will then split open. Underwile he jumps he has to scream something as "diapollo!!!".

A thought the robots could merge in one big robot eventually.

Its not transformers :)

Thanks!

Sounds like,.

Daiapolon
a.k.a. Shadow World

-more info- (http://www.anime-games.co.uk/VHS/anime/shadow_world.php)
------

Yes that's it! Ahhh sweet memories! Thanks so much!