Seel reappeared in The Misty Mermaid. During a battle with Team Rocket, Seel evolved and was able to send them blasting off. Misty's sisters were surprised by Seel's strength in battle, not knowing how powerful it was until that point.
The Gym has a second Seel that has made several cameo appearances next to Dewgong in Pokémon Chronicles episodes that featured Misty.
Related cards Cards listed with a blue background are only legal to use in the current Expanded format. Cards listed with a silver background are legal to use in both the current Standard and Expanded formats.