Make sure to get great type advantages. Only get one of the pseudo-legendaries, if any. Research EVERYTHING. The team I have right now took me about two or three months to build so take your time to get the best you can. Try to get Pokemon with two types rather than one. For example, Kingdra is dragon and water so ice is not super effective against it, like with Dragonite, Salamence, and Garchomp.