Is there any polymer 2 migration tool like polyup because I have several elements and polyup just migrate from version 0.5 to version 1.0. I know polyup isn't so efficient but at least it skips the boring parts of migrating.
Not yet. As noted in the Polymer 2.0-preview wiki:
Before releasing Polymer 2.0, we'll also provide an upgrade tool to automate as many of the changes (both required and recommended) as possible.
The team hinted in Slack the tentative release date of 2.0 is early next year, so you could expect the tool well before then.