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In Gen VI, starters were 4x weak to the Pokemon that have a type advantage.
So, for example, Greninja was 4x weak to the type combination of Grass/Fighting and so on.
Assuming the starters' final evolutions are Grass/Steel, Fire/Dark, and Water/Fairy, there rises a slight problem:
>Grass/Steel is 4x effective to Water/Fairy
>Water/Fairy is 4x effective to Fire/Dark
But, there's a problem here.
>Fire/Dark is only 2x effective to Grass/Steel
The only way to balance this?
>Fire/Fighting is 4x effective to Grass/Steel
>Grass/Steel is 4x effective to Water/Fairy
>Water/Fairy is 4x effective to Fire/Fighting
it's happening again isn't it