Given Walter was a Rocket and would've made use/archived what he thought useful out of the E4's library at Prom, is there any additional information he might be aware of? He won't have taken special interest in Lugia but given that Ho-oh is a fire type Pokemon said to have resurrected the dead, a legendary Pokemon like that would've caught his interest due to his religious beliefs and he would have made notes on whatever info he could find about it at the time.

He's also spent a lot of time at Burned Tower, both to train his Pokemon, to simply visit the ghosts there and to explore it. Are there any clues in the Burned Tower or is it simply a husk in regards to this event?