I recommend having five of each type of apex drop and trophy before you try and tame one. However you don’t need any aquatic apex drops, meaning that megalodon fins, megalodon teeth, basillo blubber, alpha leedsicthys blubber, alpha mosa teeth, tuso tentacles, and alpha tuso eyes are not needed. However in the list of things that are required are the alpha apex drops (alpha raptor claws, alpha carno arms, alpha Rex teeth) plus giga hearts. The easiest way to acquire the heart would be to lure a giga or carchar into lava on the island and center. Also just to clear up something, rhino horns are not apex drops and are not necessary. They can also request trophies, so the alpha Rex skull trophy, alpha wyvern trophy, and alpha death worm trophy. The apex drops it wants will always be available on the map you’re trying to tame it on, so you don’t need to worry about collecting wyvern talons on the island or the center. On Scorched it is harder as most of the requests are one of the three wyvern talons, plus a lot of alpha death worm trophies and alpha wyvern trophies, which are pretty hard to get, so I’d tame on the island or center.