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The fact that Landorus-T is the most used Pokemon in all formats for 10 years shows that Pokemon isn't balanced.
For one, you could start by making mons with similar spreads, movepools and BSTs to Lando with every flavor of typing. They would fulfill the same roll but have different counterplay.
OP might be shitposting but there really is no reason why most Pokemon can't be OU viable. That's just apologizing for GameFreak being retards.