Yes, the monster obtained by the effect of Creature Swapcan be tributed.
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Infestation Pandemic will make it so your Creature Swap can't do anything to their Iswarm monsters. That means they have a choice - pick an Iswarm monster, meaning Creature Swap's resolution will fail and nothing will be exchanged. Or if they have a non-Iswarm monster, they could pick that instead and let that be exhanged with your chosen monster.
Unless specifically stated otherwise (like through Soul Exchange, for example), tributes must be from amongst cards you control. You can't tribute an opponent's monster unless a card specifically says you can.
Attack him with a stronger monster (Honest works well here. Note that Honest does not target Obelisk) - Take control of him with Creature Swap (Does not target) - Destroy him with other non-targeting effects. Smashing Ground, Fissure, Torrential Tribute (can't be used against Obelisk's own summon), Mirror Force, Ally of Justice Catastor, etc. - Deal with him with other non-targeting effects, ie, bounce him to hand with Grand Mole or Legendary Jujitsu Master, or remove him from play with DD Warrior Lady, etc. - If he tries to use his Ignition Effect, you can use Divine Wrath
first you have to go at the cave or that thing at the top of electric place you will see about 8 portals or so go to the middle of that place then use tribute to the gods and battle arceus
U can use a swap magic disc but i do not know where to get it from though???? you can get swap magic threw via torrent site.