Stuck at Victini

[Jahosefah]

Yo. 

 

So I'm doing a randomized playthrough and have just made it to the Victini Quest in the postgame. You need to collect certain items off of wild pokemon that, for obvious reasons, I cannot obtain. The only item I'm missing for the curry is a berry juice from a Shuckle. And it just so happens that I found a shuckle as one of the legendaries in one of the last quests and did not catch it. This means I have no way of making the curry and no way to turn the randomizer off... any help?

[Rendolf]

I'm pretty sure that all the items you need to make the curry can be found in Aegir Cave, you just have to look around enough for them (I believe you get the Berry Juice in a mini cave but I don't remember the exact place).