Good double types for Platinum and X?

Question

I was thinking of doing a varietion of the monotype challenge with using 2 types.
I'm thinking 3 one type and 3 of the other.
I still need access to surf and fly.
You don't need to give me teams, just two types that goes well with each other.

Comments

Spear? What?

For Grass-types you can catch a Magikarp and evolve it into Gyarados. It won't take as much damage from Grass attacks and has Intimidate. It gets Ice Fang at lv. 32 as well.

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The other fossil is like a spear.  Mold breaker even works like a spear.
Won't have access to that move this early, (be around the 20's at the time).
What about Bronzor? Would that be early enough?

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Cranidos and Rampardos are not Steel-types.

Sorry if I miscommunicated, I meant that Gyarados would EVENTUALLY have Ice Fang. Bite is still decent though. Bronzer would be perfect, actually, and you can get him just east of Eterna City.

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Doctor Disco, put all that info into an answer, I'll allowed you to get the points.
And I already knew they was pure rock types, I just couldn't spell their names.

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Ah, okay :)

Answer 1

Okay so as I've said in the comments, I think Steel and Water would be good for a dual-type challenge, simply because they get useful secondary types, excellent defences and good coverage moves. They can also somewhat remedy each other's weaknesses. The following Pokémon are useful for either their secondary types, their coverage, or their utility.

Water-types

Steel-types

Comments

I forgot to ask.
Should I count Piplup as water, or steel.

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Empoleon's both types, so if you're going for a 3 Water 3 Steel team I suggest counting it as Steel because there are fewer possible Steel-types.