Pokemon Go Element cup is a new event that takes place in Pokemon Go Battle League. The Element Cup will get start from June, 28, 2021, at 1:00 pm to July, 12, 2021, at 1:00 pm.
But, in this element cup tournament pokemon developers has putted some restrictions which limits the kinds of pokemon that can be used in battle league.
Only Fire, Water and Grass type pokemons can take participate in this element cup tournament.
One more thing you should note is that your pokemons which are ready to evolve but not evolved yet are only eligible to be part of your battle team.
Pokemon Go Element Cup – Everything You Need To Know