Pokemon don't die - they turn into Gastly, Haunter, etc.
Yes they do. That's part of the plot of the Gen I games. Team Rocket killed a Pokemon, which is partially what makes them so awful.
They turn into a ghost. Not a ghost-type.
The fact that Pokemon can still be so easily modified these days with any cheat device on the market makes me sadI can spend several weeks breeding and training a team while someone else can just instantly have a team of level 100s with the perfect moveset