What decides the level of gym leaders or elite 4

[MrHusky]

I have 5lv 60 pokemons and one lv80 pokemon，and elite 4 have level of 70. Does it take the average？ What is the maximum level of elite 4 when i have 6 level     100？

[Rache]

It scales based on the highest level in your party and the number of rematches you've beaten. If it's your first rematch, you'll have an easier time if you either don't bring the lv80 or train the rest of your team to be equal to it.

 

If it's your first rematch tier and you have lv100s, they scale to around 82-89% of your level. On your 4th rematch, their levels will be equal to 100% of yours, so they'd all be lv100.

[MrHusky]

Thank you for your answer，this is extremely useful

[BrokenJoker]

They should let the e4 go all the way to lv 150 xd