Thought it would be helpful to show the team I beat Giovanni with.

Machamp has counter and dynamic punch
Morpeko has thunder shock and psychic fangs
Garchomp has dragon tail and outrage.

I started with the machamp and insta swapped to morpeko, I survived long enough to throw 4 psychic fangs and charge up halfway to a fifth then swapped back into machamp to finish the Persian.

Giovanni’s second Pokemon was nidoking which was probably worst case for me. I just threw 2 dynamic punches and let the machamp go down. I went into garchomp and threw 1 fast attack to finish the nidoking.

Finally the giratina, I threw 2 fast attacks and switched to morpeko, I charged to one last psychic fangs then let it go down. Back to the garchomp I charged to outrage and won the battle.

For those who saw my failed post: B

I hope this helped🥰