Theres a lot of established heuristics on this subject, and a few points I can toss in to help you construct an optimal mana base for Standard, Modern, Pioneer, or whatever MTG format you prefer
I also do think that objectively speaking, there is one card it looses the winner spot to right now
2x Darkrai ex 2x Weavile ex 2x Sneasel 2x Spiritomb 2x Cyrus 2x Rocky Helmet 2x Poke Ball 2x Professors Research 2x Pokemon Communication 1x Leaf 1x X Speed First things first, you ideally want to have Spiritomb in the Active Spot while you set up this deck, which is why were bringing along the Poke Ball Item cards, Professors Research Item cards, and Pokemon Communication Item cards to help ensure we have what we need in our hand from the get-go
Should you miss a critical land drop you can pitch a card and use the Mox or should you need to colour fix the Mox may be able to help out
Take a look at our Supercharged Breaker and Paradise Dragona card lists, for a glimpse at what other cards have been emerging from Japan recently.