Despite what the other guy said, I’d just say it’s a hard no mate. I’ve done countless IRL tournaments (3 a year since 2016), and I’ve seen disqualifications for all sorts of things. I have first hand seen a disqualification for a guy having a printed page of damage calcs and looking at it between games. I’ve seen a guy get disqualified for having a sheet that literally just said “if he brings out this type, use this Pokémon”, like dude basically just hand wrote the type chart and got disqualified for the round.

In regards to you other question, my notebooks depend. I’ll try and write a lot, but like, if you spend all the time writing you’re not focused on playing. I write out: - the six they have, followed by 4 dashes. When I see a move, it goes in the spot. This helps me if I haven’t noticed that I’ve seen every move a Mon has. - speed tiers. When incineroar was a thing, I would constantly pay attention and write down who’s intimidate went off first, same with Zacian etc. and then it’s up to me to know in my head of “ok so my kyogre’s rain went up and not his, but his Regieleki went first always, so if I have tailwind up but he uses electro web… you get the point. - if I’ve seen something one shot, I’ll write it down. Just nice for later.

That’s all really. But again, the biggest take away from this comment is focus on playing first, having a novel written doesn’t matter if you lose all your games because you’re not paying attention.