Trainer levels are inaccurate, especially near the start of the game. Due to the way Bulbapedia articles are laid out, trainer rematches in the Johto and Hoenn games are in the same area as the original battles, and my parser treats them as intended battles. I have attempted to fix the parser, however the issue remains and I lack the time to fully resolve the issue. This issue originates from the changing scope of the project, as the original intention was to have a large tournament between all trainers in the series, and trainer rematch teams would be part of the tournament.
There are four boss encounters during the Team Rocket attack on the Goldenrod Radio Tower
Likewise, there are two boss encounters in the Team Rocket HQ. These encounters are listed separately in the graph.
There are no trainers in Victory Road in the Johto games, other than a boss fight against Silver
Similar to Blue from the Kanto games, Silver's party changes depending on the starter Pokémon the player choose at the start of the game. The average levels remain the same, however.
The Kimono Girls Naoko, Sayo, Zuki, Kuni, and Miki are all battled at the same time in quick succession near the end of the game. They have been grouped together into a single encounter as the level of their Pokémon does not change between the five of them.
Observations
Boss encounters tend to be a much higher level than the surrounding trainers, although not quite as severe as the original Gold and Silver.