The base egg for Snichu is actually Sneasel, so it's correct
while the egg is designed after sneasel and pichu... the poke is designed primarily after pichu based on size/stats and therefore belongs as same dex as pichu... but that does probably explain why it was entered incorrectly as 226 to start with.
pichu:
snichu:
and sneasel:
edit:
starting stats is what i base it on... if its stats were changed to sneasels then it sould stay 226 other wise change to 26. starting stats are:
pichu 20 40 15 35 35 60
snichu 20 40 15 35 35 60
sneasel 55 95 55 35 75 115