Are all flying Pokémon just immune to ground?

[pokemon-overdose]

Hey guys... I need your help on this one. Just not that much of a crack.

I am developing a new Pokémon database and now I am stuck on an algorithm.

Let's take Dragonite for instance. Based on the types matchup table:
Flying takes 2x damage from electric.
Dragon takes 0.5x damage from electric.
2 * 0.5 = 1 (Which doesn't make him weak to electric)!

Now let's take Croboat.
Poisen takes 2x damage from Ground.
Flying is immune to Ground.
2 * 0 = 0.

Does that mean even though their second type might take double damage from ground they are just immune to ground?

 

[tokyodrift]

Yes that is correct. No matter the primary typing, if it is part Flying-type, it will be immune to Ground-type attacks. Though Flying is 1x effective against Ground-type.

https://bulbapedia.bulbagarden.net/wiki/Type#Type_chart