I found this in wikipedia regarding Kyabje Pabongka Rinpoche's stand on Bon religion:-
Regarding Pabongka Rinpoche's attitude toward the non-Buddhist Bön religion, he said that "The dharmas of Boenpos, tirthikas, and so forth are non-Buddhist and should not be taken as our refuge." In his famous work Liberation in the Palm of Your Hand, he calls it an "evil system", "false dharma", "not worthy of being a refuge", "plagiarized", and "invented". Although the Bon religion was originally highly hostile to Buddhists,Je Phabongkhapa never advocated intolerance towards them: "Boen is not a refuge for Buddhists; it is not worthy of being a refuge. All the same, Buddhists and Boenpos say things to each other out of attachment or hostility, and this hardly makes for honest debate. It is vital that you should know the sources of the Boen religion." To support his claim that Bon is not a fitting refuge for Buddhists, Je Phabongkhapa quoted several Buddhist scholars, including Milarepa who said, "The source of Boen is perverted Dharma. A creation of nagas and powerful elementals, it does not take one to the ultimate path."
It is really good to know this about Kyabje Pabongka Rinpoche because there is a lot of people out there in other forums and traditions smearing his name and calling him all manner of foul names. Wikipedia has quite extensive info about him as well. One thing for sure about Kyabje Pabongka Rinpoche, he left us with a lasting legacy... he propagated Dorje Shugden (at that time, pretty obscure deity) into a popular protector deity worshiped throughout the great monasteries and high Lamas and he advocated Vajrayogini, which is outside of the popular and recommended practices of Guhyasamaja, Chakrasamvara and Yamantaka. He must have clairvoyance to see all of us future practitioners - lay, lazy, self-absorbed and obstacle-ridden. I take refuge in my Lama, my lineage Lama, Kyabje Pabongka Rinpoche, Vajrayogini, Lama Tsongkhapa, Yamantaka, Guhyasamaja and my most efficacious Protector, Dorje Shugden!
Big Uncle