Trapping this creature does not work on official genesis. You will have to find a wall or overhang to grapple onto above the aggro basi and drop eggs down to them. This is the only method that has worked for me on genesis.
If you are looking to get a basilisk on crystal isles don’t even try without forcetame or spawn rock drakes due to the drakes not spawning. Thanks for adding acid spitting snakes on the map TAHT CANT BE TAMED