As an expert in the field of Pokémon evolution, I can guide you through the process of evolving Horsea. In the Pokémon games, Horsea evolves into Seadra when traded. There is no need for any specific conditions such as friendship or holding an item; the trade itself triggers the evolution. Here's the step-by-step guide:

1. Obtain a Horsea and train it to ensure it is in your party.
2. Find a friend who also plays Pokémon and is willing to help with the trade.
3. Meet your friend in-game and perform a trade, sending your Horsea to your friend's game.
4. Upon receiving Horsea, it will evolve into Seadra immediately.

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Horsea (Japanese: ���åĩ` Tattu) is a Water-type Pok��mon introduced in Generation I. It evolves into Seadra starting at level 32, which evolves into Kingdra when traded holding a Dragon Scale.read more >>