Where do Hike and WhatsApp store their messages?
For WhatsApp:

Backups can be found at:
/sdcard/WhatsApp/Databases/
(Use this tool to decrypt it: WhatsApp Key/DB Extractor or WhatCrypt)

Live database can be found at (requires root):
/data/data/com.whatsapp/databases/msgstore.db



For Hike:

Backup can be found at:
/sdcard/Hike/Backup/chats.backup

Live database can be found at (requires root):
/data/data/com.bsb.hike/databases/chats