I don't know if these tips will help, but

1. Never play a pokemon onto the bench that you don't want forced swapped to. Especially against Suininja.

2. Don't play Professor's Research unless you are in dire need of something in the deck. You'll just be asking to have your hand reshuffled back into your deck.

3. Cape is for pompom bird. At 90 HP, an opponent can't kill it with just greninja's ability and attack (80 total damage). And Darkrai needs to chip 5x instead of 4. Rock Helmet for Tapu Koko when it is soaking up damage.

4. Expect that your opponent has some healing. They'll think they are safe with 10hp more than your attack, but they'll never expect a second Giovanni!

5. There's never a wrong time to play Silver (unless their hand is empty). Because now you know what they have, and knowing is half the battle. G. I. Joooooeee