Dual types, weaknesses and resistants etc..

[Shinx3000]

I have wondered something since I read about Ghost/Normal or had an ide for Grass/Dragon. Would a certian type having another type make it better resist another type or make it still same or make it weaker to certian moves? Example:

Grass is weak to ice. Dragon is super weak to ice. If a Grass/Dragon came up, would it be more weak to ice or same x4 weakness the dragon has?

Fighting is weak to flying, but if there was a Fighting/Rock type would it still have same weakness to flying that the fighting has or would it be more resistant due to rock being resistant to flying?

And would a ghost/Normal be able to be hit by normal moves?

Would a gras/fire be weak to fire and ice or less so due to being part fire?

Anyone got ideas on this or similar dual types?

 

[Armads]

First off, Dragon by itself does not have a 4x weakness to Ice, it's just 2x like anything else. Dragon-types in general are thought of as 'super-weak' to ice only because they're most often paired with something else that is ice-weak, like Flying or Ground.

That said, it's pretty simple the way weaknesses and resistances of dual-type pokemon work out. If a pokemon's Type A is resistant to Type C, but their Type B is weak to C, C does normal, 1x damage to that pokemon. If A and B are both weak, C does 4x damage. Think of it mathematically, if one type is weak, damage is doubled. If the other is resistant, damage is halved, so half of doubled damage is normal damage.

If either of a pokemon's types make it immune to an attacking type (for example a part-Ground type being attacked with an Electric move), the damage modifier becomes 0x, at which point it no longer matters what other types are in play; anything times 0 is 0. So no, a Ghost/Normal hybrid would not be vulnerable to Normal moves.