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You can try a strap wrench, but my money would be on a chain wrench. It uses a heavier version of a bicycle chain and can be made longer. A strap wrench now is made from plastic and a rubber strap. Try rocking the standpipe back and forth as you try to twist it, and also pick up on it if possible at the same time.

For the future, (I don't know if they make one large enough for you, but a plumbing supply house would know):

There are rubber sleeves that have a large hose clamp on each end. I've seen them where one end is larger than the other too. If I could find one in the correct size, I would use that in connecting the standpipe to the elbow. I'd drive a stake in the pond bottom and somehow tie the standpipe to the stake to keep it upright, the rubber sleeve won't be stiff enough to hole the standpipe upright by itself for a long period of time. With the sleeve, you aren't putting the standpipe into the elbow. The hose clamps are stainless, and even after being underwater for 2 years you can still get a wrench on them. If you are draining the pond every year, I'd replace them once a year just because you could.