Simply register the acro bike on select then when you first enter head north and should see some kind of white bridge you should notice there are many gaps in the bridge do a sideways bike jump to go past the gaps.
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get a gameshark and get acro bike
You can find Phanpy in the Safari Zone. You will need at least $500, an Acro Bike and a Pokemon that knows Sweet Scent. Fly to Lilycove and from there travel to the Safari Zone. Okay, you'll need the $500 to get into the Safari Zone. Once inside, travel up until you see the bridge that can only be travelled over using an Acro Bike. Ride the Acro Bike over the bridge and continue to go upwards. Finally, once you are at the furthest upwards that you can go, find a patch of grass. Now use Sweet Scent until a Phanpy appears (You can simply walk around but using Sweet Scent prevents you from using up all your steps in the Zone so it's easier). Phanpy should appear after a few tries. It is in safari zone.
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).
just use b left/right at the same time ------------------------------------------------------------ press up and B at the same time to go up and down and B to jump down.
acro bike