Pokemon the Series: Ruby & Sapphire Season 904 Episode 4 Duels of the Jungle

Ash's Aipom runs away in a forest and is attacked by a Weavile. Kerrigan, a member of the Wilderness Guard Corps, rescues it and tells our heroes that the Weavile is a stray who's abandoned its group. Prompted by Jessie, who wants to catch it, Meowth learns its story: The stray Weavile used to be the leader of the group, until a rogue Weavile challenged it and took its place. It's been living alone in the forest, challenging every Pokemon it meets so it can become strong enough to reclaim its throne--and now, after meeting a Sneasel who's left the group because of the new leader's tyranny, it's ready for the challenge! The two Weavile clash in a fierce battle, and it soon becomes clear that the stray's training has paid off! At Sneasel's urging, the two Weavile decide to call a truce, and the group is reunited in harmony.