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Know speed tiers
Learn how to quickly gauge whether your opponent knows what he's doing or not, objectively good choices can go awry against bad opponents
Learn the typing chart, remember that often STAB moves are more powerful than SE ones (especially Hidden Power)
Know speed tiers
Teambuilding is 90% of the work, cover your weaknesses, be able to control hazards in singles and speed in doubles
Know speed tiers
Learn nuances of mechanics, from the basic (Dark types being immune to Prankster) to the not immediately obvious (using a Z-move ignores Encore)
Know speed tiers