Do Pokemon Fire Red/Leaf Green use the new or the old EV/IV calculations?

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A friend who got me into Pokémon told me about EV and IV's. He was saying how Pokémon R/B/Y and G/S/C have a different IV formula then the generations after that.
But do FR/LG and HG/SS go by the newer IV formula or the original one?
Also wondering is someone could maybe explain the process a little better than he did and can suggest a calculator.
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How do EVs work in Pokémon Fire Red?
If you have no Macho Brace or Pok\xe9rus\u2026How do you check EV and IV in fire red?
Your Pokemon need to be at LV 50 or 100. If you want to check for your Pokemon's IVs, you need to know its exact EVs to do so. You can also check if your Pokemon has high IVs In-Game by going to the Battle Subway. Also, you can check to see if your Pokemon's EVs are maxed out by going to a house in Opelucid City.Does Fire Red or Leaf Green have better Pokémon?
Pok\xe9mon FireRed and LeafGreen are the upgraded versions of the original Pok\xe9mon Red and Blue games, with more fun and more adventure. There are about 20 exclusive Pok\xe9mon in each version with different abilities. Besides that, there is no significant difference between the two versions.Which is more important EV or IV?
A Pok\xe9mon with high attack IVs will end up doing more damage than a Pok\xe9mon with lower attack IVs, even if they're the same level. EVs, or Effort Values, are bonus stats that your Pok\xe9mon will gain from defeating specific types of Pok\xe9mon.Let's Play Pokemon LeafGreen - Effort Values
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