Complete the EliteFour and Champion about 100 times (if not more). And if you leave the Meteorite in the 'Sinister machine' in Mt.Chimney where team aqua/magma leave it. DO NOT give it to prof Cosmo even if you are pretty annoyed by his begging. You MIGHT find it on top of Mt.Chimney if you are lucky.
Or follow two other steps:
1. Trade it from a different game
2. Get it from ActionReplay or froma Nintendo event
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No you cannot catch Entei in Pokemon Emerald.
Entei, Suicune, and Raikou are not available in Pokemon Emerald, Ruby or Sapphire. They can be brought into the game by trading.
Entei is only attainable in gold, silver, heart gold, and soul silver versions. If you wish to own one in emerald, your only options are to either use a game shark, or trade Entei over from gold, silver, heart gold, or soul silver versions. Not true you can capture entei in firered or leafgreen and Pokemon colosseum trade one from those games to emerald.
you c'ant capture entei in Pokemon ruby do you understand
Yes, Entei is a legendary Pokémon.yes