In the original Pokemon Ranger, you can catch all of the Pokemon up to the Hoenn region and the Manaphy egg, which you don't really catch, just recieve, and can be sent to either Pokemon Diamond, Pearl, or Platinum.
Tornadus, Landorous, Reshiram, Virizion, Terrakion, Cobalion, Kyurem, and Victini.
You have to catch a Mantine. The way you catch a Mantine in to catch 2 remoraids and 2 octilley.
In regular Ranger you just catch them to finish the Browser. In Shadows of Almia you catch them and bring them to Hippowdon Temple to catch Regigigas.
transfer it from ranger but you need an event on ranger to do this
No, none of the starter pokémon appear in the wild in Pokémon LeafGreen. You'll have to trade with other games.
You can catch a Meditite in the Underground Waterways.
you don't catch it
latios and latias appear in random patches of grass and areas of water after you catch Rayquaza or make him faint.(after saving the world in Sootopolis.)
that Pokemon is not in Pokemon ranger, Pokemon ranger shadows of almia, or Pokemon ranger guardian signs
you have to trade it from Pokemon ranger
ABXY
Sadly, no. The creators of the game forgot to add in the Pokedex, so trading is impossible without GameShark. :(