Well, depends on what your opponent is. Overall, I choose Swellow because it has excellent speed (base 125), and a decent attack of 85. Give it a focus band, and give it 252 Speed, 252 Attack, and 4 HP EVs. Here's a good Swellow moveset: Endeavor, Facade, Aerial Ace/Hidden Power Flying, Steel Wing. The object of this moveset is to get poisoned with toxic. This activates guts, which boosts your attack. Facade will do X 2 damage, along with STAB, which is really strong for a little bird like Swellow. When you get extremely weak, use Endeavor, and that'll lower your opponents HP. Don't give it Double-Edge or Sky Attack because Swellow is frail.
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you c'ant capture entei in Pokemon ruby do you understand
Capture either a latios or latias
fortree city. flying types
mudkip
You can capture Feebas on Route 119 in Pokemon Ruby, this is dependant on the phrase in Dewford (that changes it's location) and is luck to find the correct tile that Feebas appears on when fishing.