Stat = ((BS * 2 + IV + EV/4) * L/100 + 5) * P
where BS is base stat, IV is individual value, EV is effort value, L is level and P is the effect that personality has(either 1, 1.1 or 0.9).
Hit Points = (BS * 2 + IV + EV/4) * L/100 + 10 + L
where BS is base stat, IV is individual value, EV is effort value and L is level.