Heracross is in the Safari Zone. Use an Acro Bike to get across the poles (white lines) and go North. The areas there hold Heracross (they are rare and hard to catch so beware).
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Yes, You can catch Groudon in Pokemon Emerald.
You can't catch one in Pokemon Emerald.
No you cannot catch Entei in Pokemon Emerald.
You can't catch a Bellsprot in Pokemon Emerald. You trade it from Pokemon Leafgreen!