Walkthrough
Just south of the main area of Seven Island is the Canyon Entrance. Is small path is full of Pokemon Trainers and Wild Pokemon, leading you straight to Sevault Canyon on your way to the Tanoby Ruins.
Wild Pokemon
Grasses:
Sentret (30%): Levels 10-15
Spearow (20%): Level 44
Fearow (15%): Levels 48-50
Phanpy (15%): Levels 10-15
Meowth (10%): Level 41
Persian (5%): Levels 47-50
Psyduck(FireRed)/Slowpoke(LeafGreen) (5%): Level 41
Pokemon Trainers
Aroma Lady Mia: Level 50 Bellossom, Level 50 Bellossom
Juggler Mason: Level 47 Voltorb, Level 47 Pineco, Level 47 Voltorb, Level 47 Pineco
Pokemon Ranger Nicolas: Level 51 Weepinbell, Level 51 Victreebel
Pokemon Ranger Madeline: Level 51 Gloom, Level 51 Vileplume
Young Couple Eve & Jon: Level 50 Golduck, Level 50 Psyduck
Pokemon Trainers - VS Seeker Rematch
Juggler Mason: Level 52 Electrode, Level 52 Pineco, Level 52 Electrode, Level 52 Pineco
Pokemon Ranger Nicolas: Level 55 Victreebel, Level 55 Victreebel
Pokemon Ranger Madeline: Level 55 Vileplume, Level 55 Vileplume