The general trend as of now seems to be adding a defensive backbone to our currently offensive pair, Axew / Ponyta. Rayjay's Lileep provides a solid switch in to bulky Water-type Pokemon that give Axew issues (Scald is a bitch) and that threaten Ponyta. The primary offenders imo are Chinchou and Staryu. With RestTalk Chinchou usage increasing, I can definitely see the viability of Lileep, and expect its overall usage to increase. Stealth Rock is a very very useful thing for an offensive Pokemon such as Axew, so that utility is also important. Furthermore, Sand usage is increasing, so once again, Lileep makes a fantastic Pokemon to have in a Sand based metagame. This would make Snover a scary threat--coincidentally, we have Ponyta, one of the greatest Snover checks in the tier. Lileep seems like an all around fantastic suggestion, as it provides incredible utility with Stealth Rock and its walling capabilities, along with a check for Murkrow AND Drilbur, both of which big threats for our current pair. With HP Rock, it also gives us a bit of creativity.
Comatthew's Misdreavus is also kind of really anti metagame, and useful for our team. While it doesn't provide the same utility Stealth Rock and special walling capabilities of Lileep, it makes up for it with its strong offensive presence. To be completely honest, I don't really like Misdreavus in this slot. It is a great Pokemon as we all know, but I don't think this particular set is providing that valuable of a service. Heal Bell is a great boon to an offensive Pokemon such as Axew, or a fast bulky Pokemon such as Ponyta, I agree. Assuming we have Lileep, though, we already have no problems taking on Scald. Ponyta is already immune to Burns. It does help with beating Porygon though, as Thunder Wave is gaining popularity. In that regard, Heal Bell Misdreavus is a creative yet still excellent cleric. My main problem with the set is Perish Song, as I don't really think that's too useful in this metagame. With things just hitting hard off the bat, Perish Song doesn't do anything too useful. If we replace Perish Song with HP Fighting, though, then I think this is a fantastic addition to our team. It's a good Mienfoo check though.
With the two suggestions from RayJay and Comatthew, we are trying to add more bulk on this team, turning it into a rather good balanced team. We can maintain the balanced nature of the team, and explore, well, standard team building with an end game sweeper. Or if we try to explore more offensive suggestions, we can try and create a good balance of bulk and offense to try and figure out the perfect blend for this team.
There's a lot that we can do with this team from this point out, as both Pokemon chosen are strong, bulky, and offensively threatening. Do we want to try and bulk the team from here on out, creating a solid defensive core to let our offense do what it needs? Or do we want some more bulk with solid offensive Pokemon to maintain momentum? With RayJay's Lileep, we would have an amazing wall that also helps maintain momentum, being threatening to Pokemon such as Larvesta, Murkrow, and Natu with HP Rock.
Regardless though, I think we should try and focus on creating a team that limits the opponent's ability to respond. Ponyta is already good at stealing momentum, as is RayJay's Lileep. Comatthew's Misdreavus helps us gain momentum through Heal Bell.