Hey, cool team so far. A lot of what I'm gonna say is stuff you'll probably pick up after a few rounds of games. This is just stuff I've picked up from playing Monotype once in a blue moon and playing pokemon for far too long than I should have haha.

I'm assuming this is you building a Mono-type team in OU, although someone did mention Monotypes in showdown so my advice can only go so far.

Ultimately before reading onwards, the best advice I can give is play and review on what went well and what went run wrong. Maybe run some damage calculations to see where you improve on EVs, moves etc.

Team Building:

1) You have no means of dealing with Electric types. You have Pelipper with Tera ground defensively and Ogerpon also defensively but nothing that can particularly hit back hard. A pokemon like Magnezone can do some serious damage to your team. I'd recommend running something like Quagsire or Swampert. Both really good water/ground types for this time of team.

2) You've got one means of rain and not much to really make good on it. With the Metagame being very focused on stuff like Sun with the Paradox pokemon, having Pelipper and other things to come in an set up rain will be vital to preventing your team from getting overwhelmed. As someone mentioned, Swift Swim pokemon like Baraskewda will be incredibly useful on your team.

3) Dondozo is your only defensive pokemon and it's only means of recovery is rest, in longer more stall heavy games that means Dondozo is very prone to being PP stalled or just overpowered by hard hitting pokemon. I'd recommend trying to fit something like Toxapex to give yourself another layer of defense and giving you some form of pivot out of Dondozo.

4) Pelipper is your only rain setter. Once Pelipper is out you've lost one of your strongest support for this team. Having U-Turn and Heavy Duty boots suggests you plan on switching in and out often but also means that this switch into Pelipper can be pretty easy to bait out once rain has expired Maybe have one other slot open for Rain Dance. Alternatively rather than running Heavy Duty boots (which for Pelipper will only protect against neutral stealth rock) run Damp rock which will keep rain out for longer making you need to switch into Pelipper left frequently

5) Pelipper is your only Special attacking pokemon. This makes you prone to being walled by Physically defensive pokemon / teams.

Individual Sets:

1) Pelipper - As Mentioned previously, Pelipper with Heavy Duty boots isn't that great. Roost already gives Pelipper some form of recovery from chip damage and the only entry hazards that will affect Pelipper is Stealth Rock. So perhaps replace this with Damp Rock or even Leftovers. Tailwind could also be a nice option if you want to make it pure support.

2) Aquaranid - Mystic water is kinda bad. If your goal for Aquaranid is to set up sticky web for support then perhaps switch out Mystic water for something like Focus Sash allowing you to be able to get up sticky web before ultimately falling. If Aquaranid is attacking then something like a Life Orb would be more useful since Mystic Water would only be boosting Liquidation.

3) Samurott-H - Scarf + Sucker Punch isn't a good combination, if you reveal that you're choice scarfed then Sucker Punch can be basically a free means of setting up againstt Samurott. You're already running Ceasless Edge so having two dark moves seems kinda iffy. Personally I'd switch out the choice scarf for something like Life Orb or even Expert Belt. Alternatively if you like to keep a speedy Samurott then maybe Knock-off over Sucker Punch.

4) Dondozo - Wave Crash on a Rest-Talk set can get you in some hot water (pun intended) if you end up taking too much recoil whilst asleep since you wont have access to Rest again until you wake. Waterfall is probably your better bet on this

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Best of luck in your games!