it's not about the description, it's about the code!

And "pokemon hit one by one" is a werid way to tell that the first argument hits first, meaning that in my example, slowpoke should definitely win, as you stated it, tho your reference solution expects pikachu.

=> don't resolve issues if you're not sure you handled them. Correctly.

As @docgunthrop pointed out, there're already several katas about 2 fighters exchanging hits.

Start:
  { name: 'Sandslash', dmg: 11, def: 2, hp: 118 }
  { name: 'Slowpoke', dmg: 11, def: 11, hp: 14 }

After 13 attacks:
  { name: 'Sandslash', dmg: 11, def: 2, hp: 1 }
  { name: 'Slowpoke', dmg: 11, def: 11, hp: 1 }

Sandslash attacks and wins:
  expected 'Winner: Sandslash' to equal 'Winner: Slowpoke'

Nothing's good.

You could probably just explicitly say something like A pokemon will always deal at least 1 damage to the opponent, even when their damage is less than or equal to the opponent's defense.

As @Blind4Basics mentioned above, this information should be provided in the same context as the information about calculating damage, rather than as a note at the end. Flow of information (ie. continuity) is something that should be considered when writing your descriptions so as to avoid confusion.

Rewrute description. Is this look better now?

Does all fine now? I check reference, all look good.

So me need change cata or no? If it possible say me hot write more clear in rules. I am bad in English. What i want to say. If pokemon1 have 10 damage, and pokemon2 have 15defence. Pokemon1 in anyway deal 1 garanted damage. 10 - 9 = 1. 10 - 10 = 1, 10 - 100 = 1. But 12 - 10 = 2 and so on. Help me please. Many people say it wrong, but i check my solution many times and all look fine.

Marking this issue as resolved, but the description can be more clear about what minimal deal damage is 1 is supposed to mean. At first it sounded like any given Pokemon will have a minimum of 1 as their 'dmg' attribute.

Pikachu deal 1 damage per hit(12 his damage - 11 Mewtwo defence = 1)

Mewtwo deal 1 damage per hit(17 his damage - 17 Pikachu defence = 0, but minimal is 1, you can read this in note)

So Mewtwo should be the winner here. Its right?

the reference solution is incorrect, for now.

Is it impossible to solve this? It says that pikachu should have won, despite it being impossible for pikachu to win: https://cdn.discordapp.com/attachments/644693971897155602/715287991098015874/unknown.png
^ that's what I'm seeing in my results

Edit: Nevermind I just saw that it says they deal 1 damage minimum.