How do you get secret power?
Get from a guy on route 111, after the you can buy it at the slateport marketplace
Secret power can make secret bases for you find a tree or bush or indent in a wall then use secret power on it and inside is a base this is a place where you can decorate and customize your own place! Also if you mix records with other ruby and sapphire and emerald games you can battle other peoples secret bases! Secret power also can inflict opponents Pokemon with poison, flinch, parlyze, sleep, and…
Blastiose can't learn Secret Power naturally, so you have to find Secret Power as a TM then teach it to your Blastiose. Then, as you would know by now, when u teach it Secret Power, you will have to delete a current move because a Pokemon can only know four moves. When it asks you to delete a move, delete Bite.