Amid everyone thinking about how cool Staraptor and friends are, Swellow was forgotten. Swellow does have some good uses and might actually see some more use in D/P if used well.
http://serebii.net/pokedex-dp/277.shtml
Normal/Flying Type
60 HP/85 Atk/60 Def/50 SpA/50 SpD/125 Spd
Trait: Guts
Physical Movepool:
Beak Peck
Quick Attack
Endeavor
Aerial Ace
Frustration/Return
Steel Wing
Giga Attack
Somersault
Pursuit
Sky Attack
Brave Bird
Special Movepool:
Not worth mentioning
Support Movepool:
Growl
Agility
Toxic
Protect
Feather Rest
Rest
Sleep Talk
Substitute
Supersonic
Refresh
Mirror Move
Whirlwind
Movesets:
Swellow @ Burn Orb
-Brave Bird
-Return
-Pursuit
-Somersault
Burn Orb activates Guts giving Swellow some boosted Attack power while still being versatile. Also, it makes it so that Swellow does not have to worry about other status effects since Burn means that it won't have to sacrifice its incredible Speed to get a lot of Attack. This is best used with a Wisher of some kind since Sandstream + Burn Orb will wear it down quickly. However, this can be a great lategame sweeper with the powerful STAB Brave Bird and Return. Pursuit doesn't let Gengar and friends escape easily and Somersault lets it do damage while switching out.

http://serebii.net/pokedex-dp/277.shtml
Normal/Flying Type
60 HP/85 Atk/60 Def/50 SpA/50 SpD/125 Spd
Trait: Guts
Physical Movepool:
Beak Peck
Quick Attack
Endeavor
Aerial Ace
Frustration/Return
Steel Wing
Giga Attack
Somersault
Pursuit
Sky Attack
Brave Bird
Special Movepool:
Not worth mentioning
Support Movepool:
Growl
Agility
Toxic
Protect
Feather Rest
Rest
Sleep Talk
Substitute
Supersonic
Refresh
Mirror Move
Whirlwind
Movesets:
Swellow @ Burn Orb
-Brave Bird
-Return
-Pursuit
-Somersault
Burn Orb activates Guts giving Swellow some boosted Attack power while still being versatile. Also, it makes it so that Swellow does not have to worry about other status effects since Burn means that it won't have to sacrifice its incredible Speed to get a lot of Attack. This is best used with a Wisher of some kind since Sandstream + Burn Orb will wear it down quickly. However, this can be a great lategame sweeper with the powerful STAB Brave Bird and Return. Pursuit doesn't let Gengar and friends escape easily and Somersault lets it do damage while switching out.