Top Ten Pokemon Dual-Typings with Notable Weaknesses

Dual-type Pokemon tend to have advantages with STAB at times, but they can also have notable weaknesses which can really put a dent in these Pokemon should they be hit with a powerful offensive move. Let's see which ones are most notable.
The Top Ten
1 Grass/Bug

This is a dual type with two 4x weaknesses in Fire and Flying, while retaining most of the usual weaknesses, making this one weak typing.

2 Rock/Ground

It makes me wonder why the first few gym leaders special in Rock type Pokemon when the most notable weaknesses of both are Water and Grass. Should be obvious that this typing isn't that good.

3 Steel/Rock

Has major weaknesses to Fighting and Ground, but keeps many resistances.

4 Water/Flying

Notably having a major weakness to Electric

5 Dragon/Flying

Major weakness to Ice, while also adding a Rock weakness.

6 Ground/Dragon
7 Water/Ground

While immune to Electric, it's sole weakness to Grass is 4x.

8 Bug/Steel

Like Water/Ground, has only one weakness but it's a 4x one to Fire

9 Grass/Flying

My idea is that if you have a Pokemon with a 4x Ice weakness, you better be extremely careful.

10 Ground/Flying
The Contenders
11 Fire/Rock

Has two 4x weaknesses to Water and Ground

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