You are great. In the lighthouse where we found Ampharos, there was a sailor who said that!
That's true. Platinum would be before than GSC, so it could be Electric at first, but after travelling to Sinnoh, he found steel type. (Steelix is everywhere in Sinnoh, and it's the first fully evolved by a trade in the game...) It would play as Electric in Platinum, but when she came to Johto, she changed to Steel.
Woah. I guess that means Jasmine is at least 80% likely to get a new job as Gym Leader in Sinnoh then. Sunnyshore even has a lighthouse, so it'll be almost like home for her.
D/P and G/S/C and perhaps Emerald take place three years after R/B/Y, R/S and FR/LG. Makes you wonder why there are two Jasmine's at the same time. As soon as she lost in Johto she must have taken a boat to Sunnyshore extremely fast. But then she rambles on in Sunnyshore about her "travels" and how she was inspired by seeing trainers have fun with their Pokemon. Kinda hard to do on a boat in a few days. But ignoring the messed-up Pokemon timeline, she seems most likely to get the job.
150/120/100/120/100/90 sounds like a good prediction for the new forms stats.