Once the time for Mystery Gifts is up, is it possible to get them any other way?

Question

I have just started playing soul silver and noticed that many mystery gifts have already come and gone.

Answer 1

Some Mystery Gifts in Generations IV and V are still available through the DNS Exploit, a process that takes advantage of the games' DNS settings to access old events. Any event accessed through this method is legitimate and will pass hack checks. Not every old event is available; for a complete list, and a guide on setting up the exploit, please reference the links below.

How to obtain all the Gen 4/5 mystery gifts? (Pokemon Database)
How to unlock Gen 4 and 5 Pokemon Mystery Events in 2018 (Shacknews)

For other generations, your best bet is to trade with someone that received the gift. There are no similar exploits.

Answer 2

The only ways are trading for them on serebii or AR which is cheating.

Comments

I'm new to Pokemon so I don't know what either of those are

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Serebii is a website. Serebii.net and AR is action replay which they sell in stores. It gives you cheat codes which can glitch your game.

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So how dose serebii work?

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First, you go on the site, then it says enter site and click it. Second, you scroll down to wifi chat and you chat with people to see if they have the event.