Hi, that's a good Dugtrio in the Discuss my Pokémon thread. But will an IV of 25 or 29 in HP not work? Since HP IV 21 leaves the HP Stat as 4x+1 (x is the HP Stat of the substitute), with HP IV 25 or 29 the Stat will be 4x+1+4 = 4(x+1)+1 or 4x+1+8 = 4(x+2)+1. The substitutes keep a little more HP and the Dugtrio still survives with 1 HP after four subs. Anyway, good logic of yours, and good Pokémon.