the 151st Pokemon in ruby's regional pokedex is chimecho.
you can obtain one by leveling up chingling at night when it's happiness is high enough
You have to catch 151 pokemon to complete the pokedex.
You get the Pokedex after choosing your starter Pokemon in Prof. Birch's lab.
The answer is bellossom. the order is Oddish Gloom Vileplume then belloossom
catch all Pokemon
It is grimer
The original Pokedex is given to the player by Professor Birch. After the Pokemon Ruby trades with LeafGreen or FireRed the National Pokedex will be unlocked.
beat the hoenn pokedex and go to prof.birch
http://pokemondb.net/pokedex/national
www.serebii.net/pokedex-rs/
yes,it is the hoenn pokedex you can get only in ruby,sapphire and emerald.
There are 202 including jirachi and deoxys.
When you complete your pokedex, you'll know