In the history of opponents vs. The Toronto Maple Leafs, eleven different players (min. 20 games played) have averaged at least 1.50 career points-per-game against the Leafs:
2.38 Gretzky
2.15 Lemieux
1.87 Lalonde
1.72 Bossy
1.67 Rogers
1.64 Malkin
1.61 Lindros
1.58 Sundstrom
1.57 Hawerchuk
1.55 Malone
1.55 Kurri
The most I can see for any non-1940s' or older team is the Los Angeles Kings, against whom eight players have done this over a career:
2.59 Gretzky
2.18 Lemieux
1.73 Esposito
1.67 Federko
1.63 Hull (Bobby)
1.62 Orr
1.52 Nilsson
1.50 Bossy
Who do you guess has the highest career points-per-game (again, min. 20 games played) vs. The Boston Bruins? Gretzky? Lemieux?
Nope. Ziggy Palffy -- 1.73 PPG: 45 points in 26 games played. Lemieux, Gretzky, Crosby are 2nd, 3rd, 4th.