>>28428506>>28428550>>28428694>>28428734>>28428770>not using bothserebii has relevant (core game, not anime/spinoff games) information displayed neatly with white text on a dark background, pokearth is better than the bulba location browser. But when I go to look up exactly how the move "rage" works, it has a short ddescription with no detailed mechanics. Which brings us to...
Bubapedia, which outlines the mechanics of the move rage since gen 1, with every change it has undergone, and exactly how the move powers itself up (sometimes acting on the BP, sometimes acting on the attack stat of the pokemon, depending on the generation).
TL;DR, serebii for neatly presented information at a glance, bulba for in-depth mechanics, formulas, and fun trivia.