This.
So much this. And, having tested most of this, it's entirely accurate.
Pbond is basically
the single most effective boosting ability. Feel like outclassing everything save Pure or Huge Power? Sure. Why not?
This is
on top of having the most expansive set of secondary effects of literally any ability. You have a poor man's version of Super Luck, Serene Grace, Infiltrator, Skill Link, and Mold Breaker. In some cases it's
superior to Serene Grace, as you can have secondary effects activate
twice, doing things like statusing through a Lum Berry or dropping stats past someone's White Herb
. Beside that, you also have the guaranteed stat-drop moves as mentioned above, with some other nifty options like an effective 75% Burn rate on a damaging move, 40% activation effects like Seed Flare or Night Daze, and the plethora of 30% status secondary effects.
This is the outright second-best damage boosting ability on the physical side, and
the best on the Special side. And the second-best in the realm of crit-boosting, secondary activation (And on anything with less than 50% activation rate there's not really much difference and could be argued that it's
better) sub-bypassing, and Ability-negating.
One single ability
should not be capable of doing that all at once. You can
mindlessley click whichever attack is most effective right this minute, because there's a fair chance that whatever switches in will be hit hard enough that it can't do so repeatedly, if it's not outright crippled from the effects.
This is not even
mentioning the Shade Fang combination, which kills basically everything not called Giratina or Shedinja. Giratina cannot take multiple rounds of damage very well if not Poison Heal, and often dies to secondary moves like Crunch or Moonblast, and Shedinja dies to double-Burn from Sacred Fire. Or a trapping move. Or even
sandstorm.
Tl:Dr Parental Bond is ridiculous because this is a
single ability doing all of this. At once. It may not be the best at anything (and even that's debatable) but it's second best at
everything.