So, let me just state, that I love mineral type pokemon, especially Rock-Types, so bear with me here.^^ Also, might I suggest, that some crest are optainable or faced before the dessert instead of only in the late-game.
Anyway! I love this game, so I hope I inspire you with these. I haven't read ALL posts, so sorry if something was already mentioned.
Carbink - Doubles the Damage inflicted by Stealthrock if layed by a Carbink. Adds 35% of Sp. Defense to Sp. Attack.
OR Carbink - Automatically activates the effect "Trick Room" for 5 turns upon switch-in. Adds 35% of Sp. Defense
