* Game Limitations: The game's design limits the Pokémon you can obtain through normal gameplay. Some Pokémon are exclusive to other games (like Sapphire or Emerald), others are event-exclusive, and some are only obtainable through trading.
* No Trading in Ruby: While Pokémon Ruby allows you to battle with other players, it does not have a full trading feature.
Alternative Methods (Limited)
* Breeding: You can breed Pokémon to obtain different variations and potentially rarer forms. However, this won't give you access to all Pokémon.
* Trading with Friends: If you have friends playing Pokémon Sapphire or Emerald, you can trade Pokémon to get a wider variety. However, you'll still be limited to what your friends have.
Important Note: Using Action Replay or other cheat devices can potentially corrupt your save file or ruin your experience. If you're looking for a complete Pokédex, consider playing Pokémon Emerald, which has a more complete collection of Pokémon and includes trade features.