thus make up a unit in battle, have some gameshark code, because in the event do so .. :?
Step 1: Have the said unit you wish to summon in the ENTD, give it a Unit ID (but if it is a new unit or a generic assure that it uses something other than an already given special ID)
Step 2: Use Command 44 Draw to draw that Unit ID. For smoother transition look for examples in the game, Elidibs' Apanda's for instance appear in a smooth manner.