Exporting teams in old generations inconsistent and not 1:1

[davidstone]

To reproduce:

1. Create a team in generation 1 or 2
2. Add a Pokemon to the team
3. Click export, you'll get something like

   Cloyster
   Ability: No Ability

4. Back out of the export
5. Adjust all EVs down to 0
6. Click export, you'll get the exact same output as when all EVs were maxed
7. Back out of the export
8. Adjust all EVs back up to 252
9. Click export, you'll get something like

   Cloyster
   Ability: No Ability
   EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe

In old generations, I would expect all EVs set to 252 to not print anything for the EVs line, and I would expect all EVs set to 0 to print 0 for all.

I think I would prefer 0 EVs to always be printed in gen 1 and 2, and never print 252 EVs. If I've set my Atk EV to 0 to minimize confusion damage, it's kind of strange right now that every EV is printed except Atk, even though that's all that I've changed.