How much filtration for ponds?


Hi guys, I am in the aquarium hobby and am new to ponds, so sorry if this sounds dumb.

I wanted to build a pond for my fancy goldfish around 300 gallons. I am used to doing 10x the amount of filtration as the gallon age of my tanks but I am not sure that is practical on a pond this size. I have been doing research and there is a lot of conflicting info some saying I only need 0.5x gph than the pond.

I was planning on giving each goldfish 50 gallons, so 6 goldies plus an albino pleco. Ideally I would like to only do one large water change a month. Is this a practical goal? How many GPH do I need and does my stock sound reasonable?

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