You can't catch it, but you can see it being used by a Trainer on Route 224 and then you can trade for it.
Swablu is a third generation pokèmon and so isn't in Silver.
Swablu is only available by swarming on Route 45.
Yes - a golden Swablu is a shiny Swablu and its evolved form Altaria's shiny color is also golden.
NO you cant catch syther in Pokemon pearl
You can't catch a charizard in pokemon pearl.
You can't get altaria but you can get swablu at the top of route 210 where it gets foggy.
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
It's impossible to catch Jiratchi in Pokemon Pearl version.
Swablu is a Normal and Flying type pokemon.
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.
You can't catch it in Pokemon pearl unless you have an action replay. But if you did catch it in Pokemon emerald, sapphire, or ruby, then you can migrate it