Dammit, I wanna be as good as you Don xD.
The changes have already been described above, I also think Seismitoad should have Timid Nature to outspeed Ludicolo and Beartic Adamant Nature for the power :)
Also you might consider changing the EV Spread of Seismitoad, because as it is now you're wasting EV's. Timid Nature 252 Spd Ludicolo reaches 263 speed. So Seismitoad will only need 264 to outspeed Ludicolo. Since there's nothing else with Swift Swim and Base Speed between 70-75 (Except for Anorith but he isn't going to be a threat, and if you face a Swift Swimmer with a Base Spd of above 75, you wouldn't be able to outspeed it anyways), it won't be a problem if you change Seismitoads Spd EV from 252 to 224, which brings him to a Spd of 264.
This leaves you 32 EV's which you can invest in HP.
Furthermore just an awesome team Don!
Lol, I just saw that WhiteDMist ninja'd me, so just look at his post :)
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NU is the home tier, mainly playing on PS.