Example in Zekrom status www.pokemondb.net/pokedex/zekrom
CATCH RATE 45 (5.9% with PokéBall, full HP)
Whats this 45 thing?
And i think i should ask this question in META since this is another problem with pokedex data in pokemondb...
The 45 is a number representing the catch rate, it's what the game uses internally. It ranges from 3 to 255. Higher numbers = easier to catch.
I ought to make a page explaining some of these concepts.