I'm on serebii.net Game Mechanics trying to figure out the damage calculation for Molly's Girafarig's Psybeam against the rental Haunter. Both Pokemon are at level 50 and for this part of the equation Damage = ((((2 * 100 / 5 + 2) * 219 * 60 / 289) / 50) + 2) * 1.5 * 2 * 100 / 100
Damage = ((((42) * 219 * 60 / 289) / 50) + 2) * 1.5 * 2
Damage = (((1909.6) / 50) + 2) * 1.5 * 2
Damage = 44.9
Damage = ~45

I don't understand where or how they got 42. I'm trying to play Pokemon Stadium 2 and I completed Gym Leader Castle thanks to a refreshed guide book, Prime Cup, Challenge Cup, Little Cup and Earl's Pokemon Academy and if I win the Master Ball Cup, I'll face off against my old rival from Pokemon Gold and Silver who isn't using his game boy Pokemon but his Nintendo Pokemon. Ho-oh, Lugia, and Mewtwo all at level 100 where I get to use all 6 Pokemon. I'm trying to unlock that but I keep hoping for Girafarig's Psybeam to score a critical hit on Haunter and I already know Haunter is faster so she orders it to use Double Team or Agility instead. Then it knocks out Haunter after using Agility and then it uses Baton Pass. Even Pursuit doesn't work on it. I tried that.

When doing the calculation on paper, I got confused and the damage formula equals Damage = ((((2 * Level / 5 + 2) * AttackStat * AttackPower / DefenseStat) / 50) + 2) * STAB * Weakness/Resistance * RandomNumber / 100 and I did damage = (2 * 50 /7) * 136 *65 / 85 + 50 + 2) * 2 * 50 / 100 and then I wrote damage = (30) I'm confused and intimidated because there's too many parenthesis. It says Dragonair wrote it but I don't know who that is and I have no way of knowing if his math is correct.