There are 17 different Pokemon types. Here's the list.
Grass
Water
Fire
Ice
Dragon
Ground
Electric
Dark
Ghost
Poison
Flying
Rock
Steel
Normal
Fighting
Bug
Psychic
Hope this helped.
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Many Types, but Rock and Ground in particular.
Balanced teams are trying to get all the types you possibly can with 6 Pokemon which is nearly impossible since there are 17 types. However since there are many Pokemon that have 2 types this can be done. There are many combinations to choose from the best team would consist of legendary Pokemon considering they overpower regular Pokemon.
You can have unlimited types of Pokemon if you mean type as in water, normal, electric etc... but you can only have a maximum of 4 of the same Pokemon (as in 4 pikachu's, 4 magicarp) in one deck. UNLESS it says on the card: "you can have as many as you want".
Most dark types or normal types.
I'm guessing 'Earth type' is 'Ground' types?. If it is, Water types, Grass types and Ice types. So try too get these Pokemon: Samurott, Vileplume, and Weavile.