Moon

Moon is a Special-rarity catch with no fixed home: the wiki lists its location as Regionless and tags it Admin Event. The bait field is simply a crescent-moon emoji, which is the data's way of saying there is no ordinary bait recipe. It is marked obtainable, but because it ties to admin events you cannot schedule it.

The scale is absurd. It averages 2,000,000 kg and can hit 22,365,000 kg, the 4th heaviest of the 663 fish with recorded weights. The price per kg is tiny, C$0.092, yet the average catch is worth about C$183,333, 16th of the 742 documented fish. Base XP is 500,000.

Compared with similar entries, only one other Special fish shares its regionless status: Admin Relic. That tells you how rare this category is, and why Moon is the kind of entry you only discuss after someone has seen it appear.

Verdict: do not build a routine around it. If an admin event happens while you are online, drop what you are doing and fish, because a single average Moon would outvalue nearly everything else you could catch that day. Otherwise keep fishing your normal targets. Treat any claim of a guaranteed method with skepticism, since the data lists none.