How am I supposed to say, "Rebuild your team from scratch."?

Question

If you post teams in RMT, please don't take this personally.
For example, let's pretend someone asks a question that says this.

This is my first team. It's for Uber. Please tell me what would be a good last Pokemon and give some general tips.
Wormadam-plant @ Sharp Beak
Ability: Overcoat
EVs: 84 HP / 84 Atk / 84 Def / 84 SpA / 84 SpD / 84 Spe
Lax Nature
- Seed Bomb
- Bug Bite
- Flail
- Psych Up

Watchog @ Grassy Seed
Ability: Keen Eye
EVs: 84 HP / 84 Atk / 84 Def / 84 SpA / 84 SpD / 84 Spe
Gentle Nature
- Snore
- Facade
- Shock Wave
- Thunder Punch

Delcatty @ Metal Powder
Ability: Normalize
EVs: 84 HP / 84 Atk / 84 Def / 84 SpA / 84 SpD / 84 Spe
Hardy Nature
- Flash
- Helping Hand
- Solar Beam
- Zen Headbutt

Plusle @ Occa Berry
Ability: Plus
EVs: 84 HP / 84 Atk / 84 Def / 84 SpA / 84 SpD / 84 Spe
Quirky Nature
- Grass Knot
- Rollout
- Sweet Kiss
- Charge

Ferrothorn @ Assault Vest
Ability: Iron Barbs
EVs: 252 HP / 252 Def / 4 SpD
Impish Nature
- Stealth Rock
- Spikes
- Protect
- Leech Seed

(TBD)

What am I supposed to say if this happens?

Comments

This would be a kid talking about his in-game team
If this was to happen so be careful

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Can you be more specific? What do I have to be careful for? How should I be careful?

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Try not to get too mad

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I don't think that's the problem. I just need some way to get them to learn stuff.

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There kind of isn't a specific way. I think it's more that we just give honest critique, and if they don't like it then too bad for them they asked the question.

I'd sugges tfor  them to become more familiar with the metagame, and also suggest that they don't post teams that haven't be tested at least a little (your example wouldn't last 5 minutes on Uber ladder so if someone tried to use it then they'd know there'd be no point in trying to save it. At least hopefully).

If they really don't understand there's not much else. I'm dealing with real life issues at the moment but once everything's sorted I'll spam reboot that whole guide thing purely so we can reference it in situations like these.