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Wattrel first appeared in HZ013 when it stole a sandwich that Roy had made for Fuecoco. Roy chased after Wattrel, until it reached a cliff, where it turned around to face Fuecoco. After a brief confrontation, Roy agreed to share the sandwich, only for Wattrel to steal both halves of it. Soon after, Roy noticed that Wattrel wasn't flying away with others of its kind.
In HZ014, Roy sought Wattrel out again in order to help it learn to fly. Wattrel's fear of heights made this hard, so Roy eventually got the idea of using Ludlow's fishing rod to support Wattrel mid-air while it attempted to fly. This strategy eventually succeeded, allowing Wattrel to fly as high as the others of its kind. Happy to see Wattrel flying, Roy was about to leave, only for Wattrel to fly after him. Taking this as a sign that Wattrel wanted to be caught by Roy, Murdock gave him a Poké Ball to do so. When a sudden gust of wind threw Wattrel off-balance, Roy threw the Poké Ball at it before it could hit the ground, saving it and adding it to his team.
With Roy
In HZ016, Wattrel was used in a battle against Spinel's Magneton alongside Fuecoco. During the battle, Wattrel started a fight with Fuecoco which caused the latter to aim an Ember at Wattrel, unintentionally hitting Magneton instead, taking it out instantly. After Magneton was defeated, the two teammates continued their squabble which caused Roy to break up the fight and temporarily leave the battle.
Personality and characteristics
Wattrel's fear of heights
Like Roy's Fuecoco, Wattrel has shown to be gluttonous by stealing the Fire Croc Pokémon's sandwich. Despite being a Flying type, it initially had a fear of heights, but it managed to overcome its phobia with Roy's help. After flying for the first time, Wattrel came to enjoy it. Wattrel is noticably smaller than others of its kind.
At first, Wattrel wasn't interested in Roy, acting aggressively towards him even when he tried to share his food with it. However, after Roy help it learn to fly and overcome its fear of heights, Wattrel took a liking to him and refused to leave his side, as it immediately flew back to him as he tried to walk away.