cindaquil must be migrated from emerald version... in emerald, once you catch all the pokemon, the professor offers you one of three pokemon... you may pick from the johto starters (cindaquil, chikorita, and totodile)
Unfortunately, you cannot get Cindaquil in Diamond or Pearl without migrating from a previous game.
You have to trade with sombody who has heartgold or soulsilver. You cant actually catch it
cindaquil
"Good 'Quil Hunting".
NO you cant catch syther in Pokemon pearl
You can't catch a charizard in pokemon pearl.
neither of them is better, they are both the same, but in diamond, you catch dialga, and in pearl, you catch palkia, and you can catch different Pokemon in each game for example: you can catch this Pokemon in diamond, but not pearl but: you can catch this different Pokemon in pearl, but not diamond
you can certainly catch Dioxies in the game Pokemon pearl
the only way to get cyndequil is to catch ALL 200 hoen Pokemon and get a call from the professor and he will give either a totodile, chikerita or a cyndiquil (1 only)
It's impossible to catch Jiratchi in Pokemon Pearl version.
In Pokemon Diamond and Pokemon Pearl, there is no possible way to catch a Giritina. You can, however, either catch one in Pokemon Platinum or trade with someone who does have one. In Pokemon Pearl, you catch Palkia at Spear Pillar. In Pokemon Diamond, you catch Dialga at Spear Pillar.