In my view the Pike is a bit lacking with no shield and the strength bonus isn't enough to justify a 2h weapon that looks cool and variety is awesome, but is mechanically far behind. I suggest at the least an increase to 2d4, d10 or even d12 or similar variation as other weapons such as 2d6, 3d4, etc.
The pike is oddly positioned among the large category two handed weapons. Of those that are two-handed weapons they are oddly low with just a 1d8 which a lot of one-handed weapons are with a few being 1d10. Halberd, Greataxe, Heavy Flail were two handed weapons adjusted from 1d10 to be more competitive weapons. A lot of weapons do have an exotic feat tax, but, some of them are martial weapons
I looked at many one handed weapons that surpass or meet the pike and are able to be used with a shield and I feel that it equally the billhook in the same niche of the spear family it should at least be more damage than this weapon with the billhook's damage being just fine as it is a basically another slashing weapon with a similar design of the spear.
Pike - Large - Two handed Simple, Primitive, Sea Elf - Polearm x3 piercing
Other Large two handers together:
1d8 melee weapons which are all one-handed weapons:
1d10 one handed weapons:
