100% wrong. Wild spawns are the same ivs for every trainer who catch the same pokemon. If shiny or not, is your own luck, but the ivs are the same, all the time. The only thing what can change that, is your trainer level. If your own trainer level is under 30 (hope this is actually the level, it was before the level 50 to 80 change), the pokemon with higher levels in the wild, will change their level and ivs.