So we had this question recently: http://pokemondb.net/pokebase/meta/9797/abbreviation-solution
I had actually started compiling some things for a "glossary" which is currently linked in a few places around the site (mainly the "Egg Cycles" link on the pokedexes). Here it is: http://pokemondb.net/glossary
I've opened up another Google Docs spreadsheet for anyone who wants to help out! I added a few people in already but if you want to help, answer here. You must be able to write in sentences ;)
I want to mostly have common terms from the games themselves and the game mechanics (like the Egg Cycles example). But competitive terms are fine if they are popular (no random Pokemon name combos like Magtrio).