Keen Eye is an ability that prevents the Pokémon from getting lower accuracy. It also make it less probable to encounter low-leveled wild Pokémon.

Pokemon

Pokédex	Pokémon	Sprite	Type	Obtained
#016	Pidgey			Natural
#017	Pidgeotto			Natural
#018	Pidgeot			Natural
#021	Spearow			Natural
#022	Fearow			Natural
#083	Farfetch'd			Natural
#107	Hitmonchan			Natural
#161	Sentret			Natural
#162	Furret			Natural
#163	Hoothoot			Natural
#164	Noctowl			Natural
#215	Sneasel			Natural
#227	Skarmory			Natural
#278	Wingull			Natural
#279	Pelipper			Natural
#302	Sableye			Natural
#396	Starly			Natural
#431	Glameow			Dream World
#434	Stunky			Dream World
#435	Skuntank			Dream World
#441	Chatot			Natural
#451	Skorupi			Dream World
#452	Drapion			Dream World
#504	Patrat			Natural
#505	Watchog			Natural
#580	Ducklett			Natural
#581	Swanna			Natural
#627	Rufflet			Natural
#628	Braviary			Natural