Do decks have to be based on 2 types?

Most of the best decks in the competitive format aren't based on types, but rather based on combos with other cards in the format. Basing your deck only types cuts down the card's consistency, hurts the deck against any Weakness/Resistance, and you lose the option to run other techs.

So in short, a deck can have an unlimited amount of Pokemon types in it. However, it's best to create a deck out of combos instead of types.
 
there's no specific rule on how decks are meant to be built. They can be based on anything, heck you could use 4 different types of pokemon in your deck if you feel it necessary or 1 if you want to keep it simple (though this isn't Magic the gathering, so the whole type/colour concept couldn't be applied in the same way).

The only thing you should keep in mind when building a deck is whether of not the pokemon within the deck can help support eachother, mainly through their attacks o poke-powers/bodies, e.g - pokemon "A" has an attack which deals 30 damage to each of your opponents benched pokemon and Pokemon B has an attack or poké-power which places damage counters on any pokemon. How do they help eachother? Pokemon B makes Knocking out multiple pokemon easier for Pokmeon A by further damaging the already damaged pokemon, speeding up the damage process. Though in some cases, 1 pokemon could usually fill the role of Pokemon "A" & "B.
 
i usually base decks around 2 different types. 3 max
anymore and it makes energy requirements difficult

however, if theyre colorless or has colorless attacks, then thats a diff story

again, you just want pokemon that have synergy, not just based on types
 
Some decks are only one type (Charizard)..Other decks have ALL/most types (Arceus). It all depends on what You want to do with Your deck. As stated above picking a theme or strategy and then findout what you need to accomplish that goal.
 
Well, with techs and stuff, most decks are at least 3 types. For example, I'm running Kingdra Donphan. But, I use Uxie LA for draw and Chatot MD for hand refresh. That's four types, but I only run Fighting and Water Energy because the other two aren't attackers in the deck. And listen to Gliscor.
 
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