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If rain is the prevailing weather condition, the wielder's Speed is doubled. If the rain ends or a new weather condition is brought into play, the wielder's Speed returns to normal.
Swift Swim would have so much more competitive use if it wasn't banned in combination with Drizzle in OU. Both are still allowed, but not both on the same team. Therefore, it's restricted to either Rain Dance teams or countering Drizzle teams. If you want to pick a certain Pokemon, take your pick; Kingdra, Kabutops, Ludicolo, Gorebyss, Qwilfish and many others are all viable users of Swift Swim in rain. It's a shame that Ferrothorn exists to put a stop to nearly all of them, hence why they work well in conjunction to get rid of it. It is viable, but really now you have to dedicate a team towards it to use it effectively. In Ubers, Swift Swim has much more competitive use due to no bans regarding Swift Swim and Kyogre's usage.
Found in Dream World